一种基于SIP的分布式多媒体会议框架

在对各种会议模型的分析和对比的基础上，文中提出了一种以SIP作为控制信令的分布式多媒体会议框架DCF。构造了分布式服务器树（DST）结构，将会议系统中的资源管理、媒体处理等任务分发给DST中的子服务器处理，避免了单服务器会议系统中出现的性能瓶颈，同时，还提供了子服务器崩溃时服务器迁移功能。在给出DCF的结构后，研究了如何使用SIP协议及其扩展来完成基本的会议控制功能。

SIP-based Distributed Conference Framework

After analysis and comparisons of various conference models,a distributed multimedia conference framework-DCF using SIP as controlling signaling is proposed.DCF constructs a distributed server tree(DST)for distributing tasks such as floor management and media operation to sub conference servers,which avoid the bottle-neck of single-server conference,and can support server transfer when a sub conference server crashed.After presenting the architecture of DCF,on how to expand basic SIP mechanism to accomplish conference control functions is focused.